GeForce GT 645M vs Radeon HD 4890

Find out if it is worth upgrading your current GPU setup by comparing GeForce GT 645M and Radeon HD 4890. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce GT 645M and Radeon HD 4890. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.

GeForce GT 645M is a Laptop Graphics Card

Note: GeForce GT 645M is only used in laptop graphics. It has lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce GT 645M here:

Main Specs

  GeForce GT 645M Radeon HD 4890
Power consumption (TDP) 32 Watt 190 Watt
Interface PCIe 3.0 x16 PCIe 2.0 x16
Supplementary power connectors 2x 6-pin
Memory type DDR3\GDDR5 GDDR5
Maximum RAM amount 2 GB 1 GB
Display Connectors No outputs 2x DVI, 1x S-Video
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  • Radeon HD 4890 has 493% more power consumption, than GeForce GT 645M.
  • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon HD 4890 uses PCIe 2.0 x16 interface.
  • GeForce GT 645M has 1 GB more memory, than Radeon HD 4890.
  • GeForce GT 645M is used in Laptops, and Radeon HD 4890 - in Desktops.
  • GeForce GT 645M is build with Kepler architecture, and Radeon HD 4890 - with TeraScale.
  • GeForce GT 645M is manufactured by 28 nm process technology, and Radeon HD 4890 - by 55 nm process technology.
  • Memory clock speed of Radeon HD 4890 is 2100 MHz higher, than GeForce GT 645M.

Game benchmarks

high / 1080p 1−2 7−8
ultra / 1080p 0−1 4−5
QHD / 1440p 0−1 0−1
low / 720p 12−14 16−18
medium / 1080p 2−3 8−9
The average gaming FPS of Radeon HD 4890 in Assassin's Creed Odyssey is 120% more, than GeForce GT 645M.

Full Specs

  GeForce GT 645M Radeon HD 4890
Architecture Kepler TeraScale
Code name N13P-GS RV790
Type Laptop Desktop
Release date 22 March 2012 2 April 2009
Pipelines 384 800
Core clock speed 850 MHz
Transistor count 1,270 million 959 million
Manufacturing process technology 28 nm 55 nm
Texture fill rate 22.7 billion/sec 34.00
Floating-point performance 544.5 gflops 1,360.0 gflops
Length 241 mm
Memory bus width 128bit 256 Bit
Memory clock speed 1800 MHz 3900 MHz
Memory bandwidth 124.8 GB/s
Shared memory -
DirectX 12 API 10.1 (10_1)
Shader Model 5.1 4.1
OpenGL 4.5 3.3
OpenCL 1.1 1.1
Vulkan 1.1.126 N/A
CUDA +
CUDA cores 384
Bus support PCI Express 2.0, PCI Express 3.0
HDMI +
HDCP +
Maximum VGA resolution Up to 2048x1536
3D Blu-Ray +
Bitcoin / BTC (SHA256) 19 Mh/s
Laptop size medium sized
Optimus +
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